5x 1080 TI on linux

[pdo]

Hello.

I bought 5 Nvidia 1080 TI Turbo with 11 GB of RAM. 
I have some problem to make it work Ubuntu 20.04.4 LTS

I followed this guide (https://www.unix-ninja.com/p/Building_a_...-_Part_III), the installation of NVIDIA driver seems good but when I start hashcat, I always have this error : 

Code:

No devices found/left.

When I run lspci, I correctly see my 1080 TI. 

thank you for your precious help

Those instructions are five years old, which counts as ancient lore in GPU land.  Install the latest NVIDIA drivers and CUDA toolkit that are available for the 1080.

from hashcat.net: "NVIDIA GPUs require "NVIDIA Driver" (440.64 or later) and "CUDA Toolkit" (9.0 or later)"